I made a circuit with flexinol wire that detects heat from Arduino. Copied the code into Arduino Uno and connected it to the circuit.
The red paint on the paper was a thermochromic ink we studied in class. That color was supposed to be transparent when it got heat via flexinol wore. However, mine didn’t work. It seemed there was no problem with my code and circuit, and I guess the wire stitches had to be very small and fine.